
INST.No.INE-508-P0
-10-
5.1 Periodical maintenance
Check the followings periodically or if required.
• Cleaning of optical components
Cleaning of optical components of this trace thermometer is regularly required. If the cover glass or
the lens is splotched, remove it with a blower for cameras. If the splotch cannot be removed with the
blower, wipe the cover glass or the lens gently with a cotton ball or gauze soaked in alcohol.
• Connections and wirings
Check all connections and wirings.
(1) Cleaning of optical parts
Pay attention to always keep such optical parts as the
measurement window of the detector unit and the exchange
window of the protective case clean. If dirt or loss of
transparency is present, wipe off it with gauze, etc. It is
effective to impregnate the gauze with alcohol, ether or their
mixture of equal amount.
(2) Looseness of the
detector unit
Confirm that the mounting portion of the detector unit is
firmly fixed.
(3) Looseness of cable
connections and connectors
Confirm that terminal screws and connectors of the detector
unit, the relay box, the high-speed display/processing unit,
receiving instruments, etc. have no looseness.
(4) Volume and temperature of
cooling water
When water-cooling is executed, confirm that the volume of
the cooling water is sufficient and the temperature of the
cooling water outlet does not exceed 40°C.
(5) Purge air When air purging is executed, confirm the volume, pressure,
clearness, etc. of the air supplied.
(6) Checking receiving
instruments
When such receiving instruments as recorders and
controllers, and/or final control equipment are used together,
check these units, too.
5.2 Trouble shooting
For a trouble occurred, checks the followings and take remedial steps by referring to the corresponding
items in this manual.
1. No indication or low indication
(1) Are the connecting cables connected correctly? Check if there is any break in the cable.
(2) Is the power voltage in the allowable range?
(3) Does a measuring area cover the sight of the detector unit?
(4) Is the temperature of a measuring area within the measurement range of the detector unit?
(The actual temperature may lower than the measuring range.)
(5) Is the optical path of the detector unit clear? Also, are the measurement window of the detector
unit and the exchange window of the protective case clean?
(6) Is the emissivity compensation setting on the high-speed display/processing unit correct?
(7) Is the surface temperature of the detector unit less than 50°C?
(8) Check if the ambient temperature of the detector unit has been low and the optical system has
been dewed.
2. High indication
(1) Is the temperature of a measuring area within the measurement range?
(The actual temperature may higher than the measuring range.)
(2) Is the emissivity compensation setting on the high-speed display/processing unit correct?
(3) Check if the heat radiation from an external hot substance is reflected at a measuring area or the
detector unit.
5. Maintenance